IOO Optical Parameters
Under construction...
Mirror Location
Length
|
iKAGRA |
bKAGRA |
MCi to MCo |
0.500m |
same |
MCi/o to MCe |
26.400m |
same |
MCo to IMMT1 |
5.836m |
same |
IMMT1 to IMMT2 |
3.105m |
same |
IMMT2 to PRM |
5.017m |
same |
PRM to PR2 |
14.7615m |
same |
PR2 to PR3 |
11.0661m |
same |
PR3 to BS |
15.7638m |
same |
BS to ITMX |
53.3829m |
26.6650m |
BS to ITMY |
50.0531m |
23.3350m |
ITMX/Y to ETMX/Y |
2938.35m |
3000m |
BS to SR3 |
none |
15.7386m |
SR3 to SR2 |
none |
11.1115m |
SR2 to SRM |
none |
14.7412m |
* note that there's no PRM and ITMs in iKAGRA
* ITMX/Y for iKAGRA is 26.718m ahead of ITMX/Y for bKAGRA (considering MC length and ITM substrate; iKAGRA ITM is silica/8cm thick, bKAGRA ITM is sapphire/15cm thick)
* ETMX/Y for iKAGRA is 34.932m ahead of ETMX/Y for bKAGRA
Incident Angles
MCi |
44.729deg |
|
PR2 |
0.6860deg |
|
SR2 |
0.6860deg |
MCe |
0.543deg |
|
PR3 |
0.6860deg |
|
SR3 |
0.6860deg |
MCo |
44.729deg |
|
IMMT1 |
3.6deg |
|
IMMT2 |
3.6deg |
Beam Radii
|
iKAGRA |
iKAGRA q-parameter (at HR surface) |
bKAGRA |
bKAGRA q-parameter (at HR surface) |
MC waist |
2.3887mm |
- |
same |
- |
MCi |
2.3889mm |
0.25+16.8470i |
same |
same |
MCo |
2.3889mm |
0.25+16.8470i |
same |
same |
MCe |
4.4703mm |
26.6512+16.8470i |
same |
same |
IMMT1 |
2.5398mm |
6.0858+16.8470i / -8.5782 + 5.3878i |
2.5413mm |
6.118+16.8465i / 3.9404+0.8524i |
IMMT2 |
1.9356mm |
-5.4733 + 5.3878i |
4.4734mm |
7.0454+0.8524i / -12.9093+56.1168i |
PRM |
none |
- |
4.4828mm |
8.31934+58.1447i |
PR2 |
3.8326mm |
14.3052+5.3878i / 1.4043+0.0455i |
4.4648mm |
6.44215+58.1447i / -1.53283+0.0399461i |
PR3 |
34.015mm |
12.4704+0.0455i / -862.87+3182.3i |
36.6854mm |
12.5989+0.0399461i / 1039.26+293.48i |
BS |
33.973mm/35.400mm |
-847.11+3182.3i / 964.65+3428.6i |
36.1703mm |
-1023.5+293.48i / 1020.17+293.48i |
Arm waist |
mm |
- |
16.1970mm |
- |
ITMX/Y |
none |
- |
35.3005mm |
1500+774.597i |
ETMX/Y |
39.589mm(Y) |
2141.3+3182.3i / -2023.8+3428.6i |
35.3005mm |
1500+774.597i |
SR3 |
none |
- |
36.6846mm |
1039.24+293.48i / 12.5989+0.0399479i |
SR2 |
none |
- |
4.3324mm |
-1.48739+0.0399479i / 7.10525+54.4941i |
SRM |
none |
- |
4.3380mm |
7.63598+54.4941i |
* ETM RoCs are 7.32km for iKAGRA
* IMMT1 has RoC = 19.5 +/- 1 m, and IMMT2 is flat for iKAGRA
* Beam radii at PDs are less than ~0.4 mm
Mirror Specs
MCi
HR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Wedge Angle |
2.5 (+/-??)deg |
|
Transmission@1064nm |
(6019 +/- 48)ppm |
|
HR Loss@1064nm |
<100ppm |
|
AR Reflectivity@1064nm |
410(+/-68)ppm |
|
Diameter |
95.97 mm |
(measured by Sigma Koki) |
Thickness at max |
29.45 mm |
(+/- 0.05 mm; measured by LMA) |
MCo
HR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Wedge Angle |
2.5 (+/-??)deg |
|
Transmission@1064nm |
(6098 +/- 48)ppm |
|
HR Loss@1064nm |
<100ppm |
|
AR Reflectivity@1064nm |
302(+/-30)ppm |
|
Diameter |
95.95 mm |
(measured by Sigma Koki) |
Thickness at max |
29.50 mm |
(+/- 0.05 mm; measured by LMA) |
MCe
HR Radius of Curvature |
37.3(+/-0.1)m |
0.5% error |
AR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Wedge Angle |
2.5+/-??deg |
|
Transmission@1064nm |
4.7ppm |
|
HR Loss@1064nm |
<100ppm |
|
AR Reflectivity@1064nm |
17(+/-3)ppm |
|
Diameter |
95.95 mm |
(measured by Sigma Koki) |
Thickness at max |
29.45 mm |
(+/- 0.05 mm; measured by LMA) |
MMT1 (bKAGRA)
HR Radius of Curvature |
-8.910 +/- 0.009 m |
measured; JGW-T1605981 (spec was -8.953(+/-0.1)m) |
AR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Wedge Angle |
2.45 deg |
measured |
Transmission@1064nm |
2700ppm<T<3200ppm |
|
HR Loss@1064nm |
<1000ppm |
|
HR Transmissivity@1064nm |
0.3%(AOI = 2.59deg) |
measured by vendor |
AR Reflectivity@1064nm |
0.03% |
measured by vendor |
AR Reflectivity@670nm |
~48%（AOI=0deg), ~50.5%(AOI=30deg), ~49.5%(AOI=45deg) |
|
Diameter |
99.77mm |
measured |
Thickness |
51.76mm |
measured at thinnest point |
MMT2 (bKAGRA)
HR Radius of Curvature |
14.005 +/- 0.238 m |
measured; JGW-T1605981 (spec was 13.910(+/-0.1)m) |
AR Radius of Curvature |
Flat (>100km) |
As flat as possible |
AR Wedge Angle |
2.45 deg |
measured |
Transmission@1064nm |
200ppm<T<400ppm |
|
HR Loss@1064nm |
<1000ppm |
|
HR Transmissivity@1064nm |
0.028%(AOI = 2.59deg) |
measured by vendor |
AR Reflectivity@1064nm |
0.03% |
measured by vendor |
AR Reflectivity@670nm |
~48%（AOI=0deg), ~50.5%(AOI=30deg), ~49.5%(AOI=45deg) |
|
Diameter |
99.75mm |
measured |
Thickness |
52.93mm |
measured at thinnest point |
MMT1 (iKAGRA)
HR Radius of Curvature |
19.5(+/-1)m |
|
AR Radius of Curvature |
Flat |
|
AR Wedge Angle |
??+/-??deg |
|
HR Reflectivity@1064nm |
> 99.5% |
|
Transmission@1064nm |
0.78% (measured) |
|
HR Loss@1064nm |
?? |
|
AR Reflectivity@1064nm |
< 1% |
|
Diameter |
???mm |
|
Thickness |
??mm |
|
MMT2 (iKAGRA)
HR Radius of Curvature |
Flat |
|
AR Radius of Curvature |
Flat |
|
AR Wedge Angle |
??+/-??deg |
|
Transmission@1064nm |
?? +/-?? |
|
HR Loss@1064nm |
<100ppm |
|
AR Reflectivity@1064nm |
?(+/-??)ppm |
|
Diameter |
???mm |
|
Thickness |
??mm |
|
IFI
TGG Diameter |
20mm |
|
TGG Thickness |
12mm |
|
TGG Wedge Angle |
0deg |
|
TGGin pol. rotation (meas.) |
22.53deg |
|
TGGout pol. rotation (meas.) |
22.54deg |
|
QR Diameter |
20mm |
|
QR pol. rotation |
67.5deg |
|
QR Wedge Angle |
0deg |
|
CWP width |
25.4mm |
|
CWP Thickness |
??mm |
|
CWP Wedge Angle |
8.8deg |
|
DKDP Diameter |
25.4mm |
|
DKDP Thickness (KAGRA) |
3mm |
|
DKDP Wedge Angle |
0deg |
|
EOM
Size |
4mm x 4mm x 40 mm |
Wedge (in) |
2.8/2.8deg |
Wedge (out) |
2.8/2.0deg |
See, T1605400